allow dynamic backend setting; name files after backend they were rendered from for clarity.

alignment.py

import matplotlib, sys
backend = sys.argv[1]
matplotlib.use(backend) # need to call use() before importing pyplot

from matplotlib.pyplot import *

text(0.1, 0.5, "Top Tj", verticalalignment="top")
text(0.2, 0.5, "Bottom Tj", verticalalignment="bottom")
text(0.3, 0.5, "Base Tj", verticalalignment="baseline")
text(0.4, 0.5, "Center Tj", verticalalignment="center")
text(0.5, 0.5, "Top Tj", rotation=30, verticalalignment="top")
text(0.6, 0.5, "Bottom Tj", rotation=30, verticalalignment="bottom")
text(0.7, 0.5, "Base Tj", rotation=30, verticalalignment="baseline")
text(0.8, 0.5, "Center Tj", rotation=30, verticalalignment="center")

text(0.1, 1.0, r"$\sum_{i=j}$", verticalalignment="top")
text(0.2, 1.0, r"$\sum_{i=j}$", verticalalignment="bottom")
text(0.3, 1.0, r"$\sum_{i=j}$", verticalalignment="baseline")
text(0.4, 1.0, r"$\sum_{i=j}$", verticalalignment="center")
text(0.5, 1.0, r"$\sum_{i=j}$", rotation=30, verticalalignment="top")
text(0.6, 1.0, r"$\sum_{i=j}$", rotation=30, verticalalignment="bottom")
text(0.7, 1.0, r"$\sum_{i=j}$", rotation=30, verticalalignment="baseline")
text(0.8, 1.0, r"$\sum_{i=j}$", rotation=30, verticalalignment="center")

plot([0, 1], [0.5, 0.5])

plot([0, 1], [1.0, 1.0])

ylim([0, 1.5])

savefig("%s.png"% backend)
savefig("%s.pdf"% backend)
savefig("%s.svg"% backend)
savefig("%s.ps" % backend)